My Columbine leaves have whitish on the leaves and then then the plant seems to die out for the remainder of the summer. This has happened each year. This starts right about the time the blooms start.
Does the whitish area of the leaf look like trails or lines? If so, it is from the feeding of columbine leafminer, an insect that gets inside the leaf and eats the chlorophyll. A general, whitish cast to the leaf may be an indication of powdery mildew, a fungal disease. Neither condition usually kills the plant. It's normal for many columbines to fade out during midsummer.